I can't find my Steve Anchell Cookbook or Beyond Monochrome. I will sooner or later.

I want to add hardener to TF5. I Have Kodak QF with Kodak Hardner on the way. I don't want to wait.

I bought powdered Alum today at the grocer. Photographers Formulary also sells it in powder form. My can is labeled 'ALUM Powdered' "This colorless, odorless, crystalline powder is useful for dying fabrics". It was in the food spice section.

How much by weight to 1000 ml TF5 standard working solution of 1+3=4, should I try?

Has anyone used spice rack Alum as hardner?

I will use it on EFKE film and glass plates, both new and old.